[Mechanical Equipment Technology Edition] Daily Question 201802022: Common Faults in Refrigeration Systems (9.3)
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This post was last edited by YORK Industrial Refrigeration on 2018-2-24 at 07:43. Starting from now, in order to enhance communication among users, a 【Daily Question】 activity has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth points for active participation, 10-15 wealth points for correct answers. This question is valid for two days; no score will be assigned after that period. The compressor has seized – what method can be used to separate the end cover from the rotor? Currently, the hydraulic method is commonly used; if the separated end caps or rotors are severely deformed or worn, laser cladding can be applied, or new rotors or end caps can be installed. ============================== Premium promotions: Mechanical equipment——York screw compressors: maintenance procedures https://bbs.hcbbs.com/thread-1806833-1-1.html Mechanical equipment——Upgrading York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——GEA Grauso screw compressors: major repairs https://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment——British HOWDEN screw compressors: disassembly and maintenance https://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment——Japanese Maekawa MYCOM screw compressors: disassembly and maintenance https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
The compressor is treated by separating the exhaust end cap from the rotor, repairing the exhaust end cap, repairing the rotor, and repairing the bearing chambers; it is then assembled with strict adherence to the specified assembly tolerances； Perform high-pressure purging of the system to ensure its cleanliness ； Run in debugging mode until the noise is significantly reduced.
I’ve never encountered it. Guess: Method 1, removal using hydraulic pressure; Method 2, destroying the bearing
1. Gently tap the bearing with a hammer to try to move the rotor; once the rotor becomes loose, clean the machine head； 2. Press it out using a hydraulic press.
Solutions include: (1) Disassembly and inspection after cleaning with chemical agents； (2) Manual disassembly and inspection ； (3) Hydraulic disassembly and inspection ； (4) Disassembly by electrolysis.
The compressor is treated by separating the exhaust end cap from the rotor, repairing the exhaust end cap, repairing the rotor, and repairing the bearing chambers; it is then assembled with strict adherence to the specified assembly tolerances； Perform high-pressure purging of the system to ensure its cleanliness ； Run in debugging mode until the noise is significantly reduced.
The compressor is treated by separating the exhaust end cap from the rotor, repairing the exhaust end cap, repairing the rotor, and repairing the bearing chambers; it is then assembled with strict adherence to the specified assembly tolerances； Perform high-pressure purging of the system to ensure its cleanliness ； Run in debugging mode until the noise is significantly reduced.
Get on the hydraulic bed and press out. Then perform patch welding, grind it flat, and finally assemble it.
The main methods for dealing with a stuck compressor are as follows: 1. Disassembly and inspection after cleaning with chemical agents; 2. Manual disassembly and inspection. 3. Hydraulic disassembly and inspection. 4. Disassembly and inspection by electrolysis. Generally, the manual disassembly method is chosen first, as it is simple, convenient, and fast, and requires no handling or long waiting times; however, it is only suitable for situations where a low separating force is sufficient. When manual disassembly is not feasible, a hydraulic method is used instead. On a hydraulic press, the end cover and the rotor are forced apart to assess the degree of damage to the rotor’s shaft journals and the end cover, as well as the overall condition of the components. Based on this assessment, a repair plan is devised, and repairs are carried out; if necessary, the components are sent back to the factory for further repair and dynamic balancing. The other two methods mainly involve carrying out decomposition actions when there are chemical substances that can be decomposed or other substances that cannot be removed mechanically; these substances are eliminated first, and then mechanical separation is performed.
Answer: Heat the parts and bake them at a temperature of 110°C for 2 hours. This method can effectively resolve shaft seizure issues caused by blocked oil passages or mechanical dead points.